Compilare: user.cpp: In function ‘void eval(int)’: user.cpp:18:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[e[i]].v += val; ^ user.cpp:19:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[e[i]].st = 1; ^ user.cpp: In function ‘void read()’: user.cpp:11:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(e); ^ user.cpp: In function ‘int main()’: user.cpp:51:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.in", "r", stdin); ^ user.cpp:52:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.out", "w", stdout); ^ /tmp/cc5GHU8i.o: In function `read()': user.cpp:(.text+0x13): warning: the `gets' function is dangerous and should not be used.